My 7 y.o. son and I are taking an Amtrak trip from Nebraska to Pennsylvania later this summer, and we switch trains in Chicago. Our itinerary says we have a 3hr 50min layover; is that enough time to get from Union Station to the Willis tower and back? My son wants to check out the sky deck.
I've never been to downtown Chicago and I have no idea if it's doable to walk to the building, get up there, and get back to the train station. Any info would be awesome.